Presser device for shoe sewing machines



Oct. 27, 1953 P. ACTIS 2,656,802

PRESSER DEVICE FOR SHOE sswmc MACHINES Filed Dec. 6, 1949 7 Sheets-Sheet 1 [law/210i" PA 1/4 Ac r/s Oct. 27, 1953 P. ACTIS PRESSER DEVICE FOR SHOE SEWING MACHINES 7 Sheets-Sheet 2 Filed Dec. 6, 1949 [in/enlar- PA 04 A c 7/6 7 Sheets-Sheet 4 Oct. 27, 1953 P. ACTIS PRESSEIR DEVICE FOR SHOE sawmc MACHINES Filed Dec. 6, 1949 Get. 27, 1953 P. ACTIS 2,656,302

PRESSER DEVICE FOR SHOE SEWING MACHINES Filed Dec. 6, 1949 7 Sheets-Sheet 5 R\ M, W N wm I :w i\\ w w M @m m x 3. my Q m x m Oct. 27, 1953 P. ACTIS 2,656,802

PRESSER DEVICE FOR SHOE. SEWING MACHINES Filed Dec. 6, 1949 7 Sheets-Sheet 7 N b g 4 N 51 1 fi Q W//////// f [Wren/0r.- 79/04 Aer/a Patented Oct; 27, 1953 PRESSER DEVICE FOR SHOE SEWING MACHINES Paul Actis, Fontaine, France Application December 6, 1949, Serial No. 131,460 In France December 17, 1948 2 Claims. 1

There exist for shoe manufacturing purposes numerous types of machines for sewing lock stitches. Said machines include generally a system of aligned shafts driven into rotation by an electric motor and carrying a number of cams, e. g. four or five cams, controlling each a plurality of corresponding mechanisms incorporated to the machine.

Such cams, that are provided with as many raceways as they have parts to play, are costly and require furthermore a complete change of the cam when only one of its raceways is worn out; such changes are in fact frequent by reason of the rapid wear of certain raceways so that consequently the upkeep of the machines considered becomes extremely expensive.

Said prior machines show further numerous other drawbacks among which I may mention:

The constitution of a single-part hook which requires a substantial dismantling of the machine parts when it comes to changing a broken hook. such a breaking of the hook being a very frequent occurrence;

Similarly the constitution in a single part of the brake shoe adapted to clamp the thread, which requires, when the shoe is worn, a substantial partial dismantling of the machine for its replacement; said dismantling leads always to a loss of time, to a reduction in the efficiency of the machine and to an increase of the cost price.

My invention does away with these drawbacks and has for its object a machine for sewing shoe soles with lock stitches that require substantially no upkeep, wherein the change of the hook when broken or the change of the brake shoe when worn is performed very speedily by reason of the improved mechanical structure of said parts.

To this end, the same shaft of the improved machine carries a number of cams that corresponds substantially to the number of mechanisms forming the different components of the machine, to wit, the presser foot, the looper, the hooks, the awl and the like, said shaft being revolubly carried in bearings inside a casing filled with an oil bath.

According to a further feature of my invention, the looper is secured to the end of a telescopic arrangement, the longitudinal movements of which are produced by a cam while another cam associated with two cam followers controls its rocking movement.

According to a further feature of the invention, the brake shoe or thread clamping shoe is secured, in order to make its changing easier, to and is controlled by the end of a lever actuated through the engagement with one of the cams of a cam follower rigid with said lever and urged against the periphery of said cam by a spring provided for this purpose.

Similarly, the hook is constituted by two parts of which one engages a cam and controls the movement of said hook while the other is easily dismountable and forms the actual hook member.

According to a still further object of my invention, the presser foot may be raised at any moment of the operation of the machine through depression of a pedal so as to produce first the release of the presser foot and then its raising.

My invention will be better understood while its advantages and features will appear more clearly through the reading of the following description of an embodiment disclosed by way of example and by no means in a binding sense and that is illustrated in accompanying drawings, wherein:

Fig. 1 is a front elevational view of the head of said sewing machine.

Fig. 2 is a side elevational view thereof.

Fig. 3 is a longitudinal sectional view passing through the shaft axis.

Fig. 4 is a vertical sectional view of the looper.

Fig. 5 is a horizontal cross-sectional view thereof.

Figs. 6 and 7 are side elevational views of the presser foot that is shown respectively in its bolted fastening position and in its raised released position.

Fig. 8 is a side elevational view of the hook and of its control mechanism.

Fig. 9 is a plan view of the hook and Fig. 10 is a side elevational View of the thread clamping brake.

The machine illustrated includes chiefly a shaft 2 (Fig. 2) revolubly carried in the ball bearings 3 housed in the flanges 4 rigid with the head of the machine, said shaft 2 being driven into rotation through the agency of a pulley 5 associated with a clutch system 6.

To the shaft are keyed eleven cams, to wit:

The cam I controlling the feed carriage 23 The cam 8 controlling the means for adjusting the loop at midthickness of the leather The cam 9 controlling the presser foot 24 The cam l0 controlling the thread finger 25 The cam l2 controlling the eccentric actuating the needle 26 and awl 21 The cam I3 controlling the hook 28 The cam I4 controlling the looper 29 The cam l5 controlling the thread-stretching means 3! The cam l6 controlling the needle guide The cam l1 controlling the brake shoe or thread clamping shoe 32 The cam IB controlling the looper 29 in association with the cam 14 and a pinion l9 controlling the bobbin 33.

The head of the machine forms a fluidtight casing 2i filled with an oil bath the upper level of which may be inspected through the gate 22' and lies at a height such that the lower parts of the cams dip into said bath, whereby the rotation of the shaft 2 provides through projection a perfect lubrication of the whole mechanism; this provides, in addition to a longer life for the different parts of the machine with reference. to those already on the market, a more silent operation of the machine.

The looper 29 (Figs. 12-4 and are submitted to two different movements, to wit:. a longitudinal movement in the direction of the arrow 34 (Figs. i and 5) and a rocking movement inthedirection of the arrow 35' of Fig. 5. These displacements are. obtained through the operation of the corresponding, cams. l8 and, I 4. keyed to the shaft 2 (Figs. 3, 4 and 5).

To this. end... the looper 29 is secured to the end of. a rod. 35. the other end. of which is pivotally secured to. the end of a lever 31 (Fig. 5) the. other end of which moves in the direction illustrated by the arrow All (Big. 5), under the action of a. roller 3.8 acting as a cam follower at the periphery of. the cam IB against which it is urged by a spring 39.

The rod 36 slides furthermore through. its medial portion insidev a tube til the front end of which pivots. round a vertical axis 42 while its rear end carries two rollers 43a and 4311 the axes of. which are vertical and that engage respectively the opposite surfaces of the, cam ii. To allow the rocking movements. of the looper Z9. and consequently also of the opposite, end. of. the rod 36, the end of the lever 3'! inside. which ispivotally secured the rod 36 assumes. the. shape of a strap.

Thepresser. foot. 24 (Figs. l.,,2 6. and 7.) ispivotally secured at 44 through its rear end to a. point of a vertical rod 55a. the upper end of which is connected in its. turn with a link member 45b. pivotally connected. in its. turn to the front end of a lever 46 pivotally secured at 41' and the rear end of which is free. The rear surface. or the vertical rod 45a is provided near. its lower end with a notch 48 inside which is engaged the end of the horizontal. rod. 49;; the latter is adapted to move longitudinally, alternatingly in the direction of the arrows 5i and 52 of. Fig. 6', under the opposite actions of a spring that is not illustrated and of a lever 53' pivotally secured through one end to the abovementioned horizontal rod #6- while its other end is pivotally secured to a stationary member 54. Said lever 55+ carries nearits middle a roller 55 having a horizontal axisand' forming a cam follower cooperating with the cam 9 keyed to the shaft 2.

To the end of the horizontalrod 49 and in alignment therewithis screwed on the other hand a further rod 56 sliding in the slideway 575 and passing through the rear well of the casing 21. The rear end of said rod forms. a strap carrying tworollers 58; lyingin contacting: relationship with the rear surface of a verticalrod 59' passing through the said. strap: and. the: upper end. of. which is free: while, its lower-end is connected: with alever 61 thedisplacement: ot. which is controlled by a pedal. The rod 59 is moreover thinner at its upper end 59a. than its lower end 5%,. said two ends being, connected through. a. sloping cen-- tral portion 590.

The operation, of, thispresser foot isas follows: during the operation of, the machine the presser foot is alternatingly locked and released under the action of the cam 9 cooperating with the roller 55 engaging the periphery of the cam under the, action oi a spring and controlling, through the, agency of the lever 53 to. which it is pivotally secured, the longitudinal movement illustrated by the arrows 5i and 52 of Fig. 6 of the rod 49 the front end of which alternatingly engages and releases: the: notches: 48 so as to clamp and release alternatingly the presser foot 24.

The raising of the presser foot is furthemore performed in the following manner: through action on a pedal that is not illustrated in the drawing there is obtained through the agency of a lever Bl: a vertical upwardly directed displacement of the rod 59 as illustrated by the arrow 62 of Fig. 6 whereby the cam follower 58 is constrained to roll first on the thinner upper part 59a of the rod 59, then on the slope 59c thereof and lastly on the thicker lower part 591), which produces a tractional' action in the direction of the arrow 63 of. Fig. 6 on the rod 56' and conseq-.uently' on the lever 48 the front' of which moves out of the notches 48' so as to release the presser foot 24. Through a further depression of" the pedal the rod 59' continues moving, the direction of the arrow 62' of Fig. 6 while its upper end engages the rear end of the lever 46 that is urged thereby in the direction of the arrow 64 of Fig. 6- and that rocks round its pivot 47 so as to transform the movement described into a shifting in the direction of the arrow 65 of Fig. 6 of therod 45 that is in its turn pivotal-1y secured as disclosed to the rear end of the presser foot 26 so that this shifting of the rod fi'raises thefr'ont portion of the latter while the medial portion of the presser foot pivots'round the point 44-. leads to the position of the parts illustrated in Fig. 7" and it will be readily ascertained that this raising of the presser foot may be obtained at any mo"- ment of the working of the machine through a mere depression exerted on the pedal.

Lastly it should be remarked as' a further feature of the invention that the actual hook 28 and the. thread clamping brake shoe 3 2' are each constituted by two separate associated parts; The hook 2B I, 2, Sand is as a matter of fact secured to the front end of a rod 65 mov-- ing in the direction of the arrow 6!- of Fig. 3 under the control of a lever 68' the upper end of which is pivotal-1y secured" to said rod while its lower end is' pivotally' secured to a stationary member 69; said lever 58' including a" horizontal pivot on which is revolubly carried a cam follower ll engaging under the thrust exerted by thespring 12 the cam l3 keyed to the shaft 2- of the machine.

The thread clamping brake shoe 32 (Figs; 1, 2'

. rear end of which carries pivotallya roller P5 engaging the cam ll' keyed to the shaft 2' and against which it is urged by a spring not illus-- trated held between a stationary member l-I- and a lateral arm 18 on the bell crank 73, the dis-- placements in the direction of the arrow '59 of Fig. 10 of'the axis of the roller 15 producing the displacement in the direction of the arrow 8-lin Fig. 10 of the brake shoe 32 that engages con-- sequently a groove in the roller 82' wherein the thread isheld.

Obviously and as apparent from thepreceding disclosure, my invention is by no means limited to the embodiment described and illustrated and it covers on the contrary all the modifications ofthe machine lying within the scope of accom panying claims.

What I claim is:

1. In a machine for sewing shoe soles with lock stitches, the combination of a single common camshaft, a presser foot, a bar adapted to lock the presser foot in its inoperative position, a cam on the camshaft, a lever controlled by said cam and adapted, when operated by said cam, to urge last mentioned bar into its inoperative position, a shaped rod of varying thickness slidingly engaging the outer end of the locking bar and registering in its inoperative position with the outer end of the locking bar through a part of reduced thickness of said shaped rod and adapted to urge said outer end of the locking bar in a direction releasing the latter with reference to the presser foot through a part of greater thickness, a pedal controlling the position of the shaped rod with reference to the locking bar, means controlling the movement of the presser bar between its operative and inoperative positions, and submitted to the action of the shaped bar when pushed by the pedal beyond the position corresponding to the release of the locking bar, a plurality of further operative components of the machine, a plurality of solid cams secured to the camshaft, cam followers operatively associated with the periphery of last mentioned solid cams and adapted to impart selectively to the diiferent operative components the movements to be assumed thereby, springs urging the cam followers against the corresponding cams and an oil-filled casing in which the camshaft is revolubly carried with its cams extending underneath the level of the oil bath inside said casing.

2. In a machine for sewing shoe soles with lock stitches, the combination of a camshaft, a presser foot, a bar adapted to lock the presser foot in its inoperative position, a cam on the camshaft, a lever controlled by said cam and adapted, when operated by said cam, to urge the last mentioned bar into its inoperative position, a shaped rod of varying thickness slidingly engagin the outer end of the locking bar and registering in its inoperative position with the outer end of the looking bar through a part of reduced thickness of said shaped rod and adapted to urge said outer end of the locking bar in a direction releasing the latter with reference to the presser foot through a part of greater thickness, a pedal controlling the position of the shaped rod with reference to the locking bar, and means controlling the movement of the presser bar between its operative and inoperative positions, and submitted to the action of the shaped rod when pushed by the pedal beyond the position corresponding to the release of the locking bar.

PAUL ACTIS.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 584,675 Dancel et a1 June 15, 1897 614,938 Duplessis Nov. 29, 1898 774,654 Denne Nov. 8, 1904 1,001,980 Pearson Aug. 29, 1911 1,954,821 Leveque Apr. 17, 1934 2,446,306 Sauer Aug. 3, 1948 

